FBISE Class 9th (SSC-l)
Explore subjects and practice MCQs
3
Chapters
1,610
Total MCQs
FBISE Class 9th (SSC-l)
Answer: Waste products accumulate in vacuoles and ageing cells, which are later shed by the plant.
Answer: Leaf fall is a way for the plant to dispose of leaves loaded with waste materials.
Answer: Minerals dissolve in soil water and are absorbed through the root hairs.
Answer: Magnesium is at the centre of the chlorophyll molecule and is essential for its formation.
Answer: Nitrogen is an essential component of proteins and nucleic acids in plants.
Answer: Potassium deficiency weakens stems and causes yellowing and scorching of leaf margins.
Answer: Nitrogen is a macronutrient, while iron, zinc and manganese are required only in small amounts.
Answer: Iron is a micronutrient that is needed by plants only in small quantities.
Answer: Iron is needed for chlorophyll formation, so its deficiency causes chlorosis.
Answer: Transpiration helps cool the plant and move water, but it cannot keep plant tissues completely dry.
Answer: Lenticels are pores present on woody stems and some roots for gaseous exchange.
Answer: Stomatal transpiration accounts for about 90% of the total water lost by a plant.
Answer: Roots absorb most of the water a plant needs through their root hairs.
Answer: Active transport uses metabolic energy to move ions against the concentration gradient.
Answer: If soil water is more concentrated, minerals diffuse into the root cells.
Answer: Osmosis and diffusion are passive, while active transport needs energy.
Answer: The hypertonic salt solution draws water out of the cells by osmosis, causing plasmolysis.
Answer: Evaporation of water from leaf cells creates tension that pulls the water column upward.
Answer: Water passes from root hairs through the cortex into the xylem and then to the leaves.
Answer: Food transport is the function of the phloem, not the xylem.